# AT6604 Vehicle Dynamics Nov Dec 2016 Important Questions

Anna University Chennai - Important Questions of AT6604 Vehicle Dynamics
B.E/B.TECH DEGREE EXAMINATION NOV / DEC 2016
Sixth Semester
Department of Automobile Engineering
AT6604 Vehicle Dynamics
Nov Dec 2016 Important Questions
(Regulation 2013)

You can collect here the 16 Marks Most Important Questions asked in previous years university examinations - AT6604 Vehicle Dynamics 6th Semester Subject in B.E Civil Engineering under Anna University Chennai

AT6604 Vehicle Dynamics - All Important 16 Marks Questions

1. What do you mean by Magnification factor? Derive a suitable expression for calculating the
magnification factor for a single degree of freedom?

2. Derive the expression to calculate the Magnification factor when a single degree of freedom system is subjected to an external force. Also draw the Magnification factor vs frequency ratio. Mention your observation from the curve

3. For the system shown in figure, compute the damping ratio, state whether the system is critically damped, underdamped or overdamped. Determine x(t) for the initial condition given.
4. Describe briefly the free vibration of a vehicle with single degree of freedom.

5. Derive the suitable expression to find out the reaction forces, Maximum tractive effort and
maximum forward acceleration for
(i) Four wheel drive
(ii) Front wheel drive
(iii) Rear wheel drive

6. A vehicle of total weight 50 kN. is held at rest on a slope of 12°. It has a wheel base of 2.25 m and its centre of gravity is 1.0 m in front of rear axle and 1.5 m above the ground level. Compute the following a) Normal reactions at the wheels b) Assuming that sliding does not occur first, what will be the angle of slope so that the vehicle will overturn? C) Derive the formulae used for above.

7. A car of total weight 19620 N runs at 72 km/hr round a curve so that its C.G. moves in a circle of 80m radius with its wheel axes at an angle of 10° to the horizontal. The C.G. of the car is 1 m above the ground and is midway between the axes. The wheel track is 1 m and the diameter of the wheels is 0.6 m and each pair of axle weighs 1962 N, and the radius of gyration is 0.25 m. Determine the normal reactions on each wheel taking into account the centrifugal and gyroscopic effect.

8.  Two cars similar in all aspects excepting the one has rear wheel drive and the other has front wheel drive. If the engine power does not limit the ability to climb grades, state which car can ascend steep grades

9. The figure shows a locomotive, driving two fright cars, one of which has a loading. The loading is attached to the car body with two springs each of stiffness K3. The following data are given: m1 = 72 tonnes; m2 = m4 = 28 tonnes; m3 = 8 tonnes K1 = K2 = 0.8 MN/m, K3 = 0.3 MN/m Write the equations of motion in matrix form.
10. Find out the natural frequency and amplitude ratio in terms of ‘m’ and ‘k’ for the system shown below. Take m1 = m; m2 = 2m; k1=k2=k3=k

11. Write the system of equation for the system shown below and compute the natural frequency of the system. Take m1= 200 kg; m2=50 kg; k1=100 kN/m; k2=20 kN/m
12. The fig given below shows a locomotive engine with three fright cars. Take following data m1=72 tonnes, m2=m4=m3=28 tonnes, k1=K2=k3=0.8MN/m. Write down the equation of motion in matrix form and also find the dynamic Matrix for the above system.
13. Write short notes on:
a) Yaw velocity gain
b) Lateral acceleration gain
c) Curvature response gain for over steer, neutral steer and under steer.

14. Discuss the following:
a) Effect of braking torque
b) Effect of driving torque
c) Effect of camber thrust

15. Discuss the following:
a) Camber and Camber thrust
b) Slip angle and Cornering force

16. Derive the suitable expression to calculate the under steer coefficient with that expression compute the characteristics speed of an under steer vehicle. Describe briefly the free vibration of a vehicle with single degree of freedom

17.  The vibration of a cantilever is given by y = A {1 – COS (Î X/2L)}. Calculate the frequency
of the cantilever using Rayleigh’s methods. Cross section of the beam is circular of diameter of 50 mm, length of beam as 3 m. Take Young’s modulus as 200 GPa, Mass of the shaft as 50 kg

18.  Derive the Dunkerley’s formula to compute the fundamental frequency of the given system

19.  A shaft 50mm diameter and 3m long is simply supported at the ends and carries three loads of 1000N, 1500N and 750N at 1m, 2m and 2.5m from left support. The youngs modulus for shaft material is 200Gpa. Find the frequency of transverse vibration.  Explain in detail the step by step procedure to calculate the natural frequency using Rayleigh’s upper bound method, for a three degrees of freedom system.

20. Explain the Rayleigh method and Dunkerley method to compute the natural frequency
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